What is a market order? A market order is an instruction to buy or sell a CFD, in a specified size, at the best available market price for that size. It is important to note that a market order can be executed at a price different from quoted at the time it is placed. Once executed, a market order immediately becomes an open trade that can be watched in the ‘Portfolio’ tab. Market orders can only be placed during the trading hours of the underlying asset. A market order can have Take Profit/Stop Loss Orders attached.